The ornamentation of one of my Orandas has expanded so profusely as it has now extended down the sides of its face and blinded him. (completely covering his eyes) He seems to be as peaceful as ever, but blunders around the tank a bit. I am reluctant to change my tank set-up when I clean the tank so as not to confuse him any more. Is there any cure I am asking, i'm sure this is not unique to me.

I'm sorry that I don't have much experience with goldfish so I cannot give you a good answer about any cure for your fish's condition, BUT it's probably a good idea not to move any tank decorations around. That is what I would do if I were dealing with a blinded fish.

I will also move your post to our "Coldwater General Chat" section, so that hopefully someone with more goldfish experience may give you some advice. If you could post a photo, that may be helpful.